Open Windows PowerShell with administrative rights and run the command
powercfg.exe /h off
This way the computer will never enter hibernate mode and you will save disk space. If you want to check for any problems with the power state of the machine you can generate a report by typing this command
you will wait for 60 seconds
S C:\WINDOWS\system32> powercfg.exe /energy
Enabling tracing for 60 seconds...
Observing system behavior...
Analyzing trace data...
Energy efficiency problems were found.
See C:\WINDOWS\system32\energy-report.html for more details.